please answer

At a service-counter employee at an airport automobile rental counter, receive 22 customers per hour. The service-counter has three employees are on duty and each employee can serve 8 customers per hour. Employees are complaining about being too busy and the couter often experiences long queues and delays . a. What is the utilization of employees? b. In order to achieve 75% or lower utilization of the employees, how many employees should be added at the center? c. At the rental counter, on average, how many customers are being served at a given time